Standardize upstream info, disclaimers, screenshots

doc/DISCLAIMER.md

@@ -0,0 +1,12 @@
+* Any known limitations, constrains or stuff not working, such as (but not limited to): 
+    * requiring a full dedicated domain ?
+    * architectures not supported ?
+    * not-working single-sign on or LDAP integration ?
+    * the app requires an important amount of RAM / disk / .. to install or to work properly
+    * etc...
+
+* Other infos that people should be aware of, such as: 
+    * any specific step to perform after installing (such as manually finishing the install, specific admin credentials, ...)
+    * how to configure / administrate the application if it ain't obvious
+    * upgrade process / specificities / things to be aware of ?
+    * security considerations ?

manifest.json

@@ -1,6 +1,6 @@
 {
-    "name": "YunoHost example app",
-    "id": "ynhexample",
+    "name": "Example app",
+    "id": "example",
     "packaging_format": 1,
     "description": {
         "en": "Explain in *a few (10~15) words* the purpose of the app or what it actually does (it is meant to give a rough idea to users browsing a catalog of 100+ apps)",
@@ -8,11 +8,18 @@
     },
     "version": "1.0~ynh1",
     "url": "https://example.com",
+    "upstream": {
+        "license": "free",
+        "website": "https://example.com",
+        "demo": "https://demo.example.com",
+        "admindoc": "https://yunohost.org/packaging_apps",
+        "userdoc": "https://yunohost.org/apps",
+        "code": "https://some.forge.com/example/example"
+    },
     "license": "free",
     "maintainer": {
         "name": "John doe",
-        "email": "john.doe@example.com",
-        "url": "http://example.com"
+        "email": "john.doe@example.com"
     },
     "requirements": {
         "yunohost": ">= 4.1.3"